SEC系统维修大纲周期延长论证方法浅析
A Brief Analysis on the Demonstration Methods for Extending the Maintenance Outline Cycle of the SEC System

重要厂用水系统(SEC系统)作为冷源相关系统中重要的一部分，科学的研究维修大纲周期延长合理性，能够在保障机组可靠运行的前提下，合理的减少系统和设备的维修频次。本文以FMEA分析方法为基础，结合As-Found和定量化分析，优化重要厂用水的系统(SEC系统)维修策略周期以及大修排水检修方案。最终将CPR1000机组单次大修SEC系统两列排水改为单列排水，在保持机组核安全水平的前提下，实现大修工期缩短、降低运营成本、提高机组可用率。
The Essential Service Water System (SEC System), as an important part of the cooling source-related systems, scientifically researching the rationality of extending the maintenance outline cycle can reasonably reduce the maintenance frequency of the systems and equipment on the premise of ensuring the reliable operation of the units. Based on the Failure Mode and Effects Analysis (FMEA) method and combined with As-Found and quantitative analysis, this paper optimizes the maintenance strategy cycle of the Essential Service Water System (SEC System) and the overhaul drainage maintenance plan. Eventually, for the CPR1000 unit, the two-column drainage of the SEC System during a single overhaul is changed to single-column drainage. On the premise of maintaining the nuclear safety level of the unit, the overhaul period is shortened, the operating costs are reduced, and the availability rate of the unit is improved.